Malicious PDF — malware analysis report

Static analysis result for SHA-256 662bab73a54cbf3e…

MALICIOUS

PDF

90.7 KB Created: 2021-09-03 01:35:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 5fe296cb8e9e66674d0c93d12a5a869d SHA-1: ec8073ea66406e3a252a805b3f5d4ebad73960cf SHA-256: 662bab73a54cbf3efbaa8c24955d9cfc56d7bc181d2aa1c0f6963f05982869da
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with many URLs pointing to potentially compromised WordPress upload directories or disposable hosting. The embedded URLs and the overall structure suggest an attempt to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/b00bd852e5f61cad2a564d7099909cc2/topojitunikimomodopixu.pdf In PDF document text
    • https://sharenkon.com/files/xomajopolun.pdfIn PDF document text
    • http://stonebreaker.at/39373115725.pdfIn PDF document text
    • http://csaladiegyteruautok.hu/userfiles/files/pokesidi.pdfIn PDF document text
    • http://refah4ter.info/basefile/hotelrefah4terir/files/1744532190.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/vuranodazajow.pdfIn PDF document text
    • http://wenxuezj.com/images/File/91324944362.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/60c4a510e8c9ed5c66180f90704d39b9/48489531396.pdfIn PDF document text
    • http://iacsglobal.iacsinfo.org/content/uploads/files/18241238315.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/31841707234.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/kasic85qutj0nc5atesam87qe8/lesutepilaz.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d55b3f4d719---30983327469.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610078ffee01b---tokizur.pdfIn PDF document text
    • https://qualityroofinnandsuites.com/nbloom/fckuploads/file/78407162990.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160838ff20724a---30175935915.pdfIn PDF document text
    • http://zonwering-nederland.nl/ckfinder/userfiles/files/keluxalazobirem.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b07e09d24b6---sunajo.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c7fdbfbf7---talajixasuxid.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f338074aa5---16234923768.pdfIn PDF document text
    • http://electric-kernbichler.at/sanaso.pdfIn PDF document text
    • https://littleitalypizzany.com/nbloom/fckuploads/file/vipibakizaduxibenire.pdfIn PDF document text
    • https://www.igescanada.com/ckfinder/userfiles/files/lilogifefoxemo.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/50646228952.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=corrado+malanga+espa%C3%B1ol+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7A 18528 bytes
SHA-256: 9fba6bd96676d1b566d10b1832704389475d04b82b6af9f9027946cf80f5f211
font_01_sfnt_off00012ac3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AC3 10888 bytes
SHA-256: 4a6539c4d5e15b286fb63a33891f079e860af3c8bd7a04bc8d1a8701a872ea87
font_02_sfnt_off0001437b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1437B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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